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A real-time safety status monitoring method for bridges using single-measuring-point response

A safe state, single measuring point technology, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problem of increasing the initial investment and daily operation and maintenance costs of bridge operators, increasing the difficulty of structural monitoring, and redundant monitoring data. and other problems to achieve the effect of improving real-time monitoring efficiency, reducing monitoring equipment costs, and reducing the amount of calculation.

Active Publication Date: 2021-07-27
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current bridge structure health monitoring system, since the construction of the bridge structure is completed, a large number of sensors have been installed on the bridge structure to monitor various structural characteristics in real time, resulting in an excessively large amount of information stored in the bridge structure monitoring system.
On the one hand, the total amount of sensor equipment installed in the current bridge structure has greatly increased the initial investment and daily operation and maintenance costs of the bridge operator; on the other hand, the redundant monitoring data has increased the difficulty of structural monitoring

Method used

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  • A real-time safety status monitoring method for bridges using single-measuring-point response
  • A real-time safety status monitoring method for bridges using single-measuring-point response
  • A real-time safety status monitoring method for bridges using single-measuring-point response

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Experimental program
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Effect test

Embodiment 1

[0063] Such as figure 1 as shown, figure 1 It is a flow chart of a bridge real-time safety state monitoring method using acceleration response of a single measuring point disclosed in an embodiment of the present invention. The schematic diagram of the steel bridge model used in this embodiment is as follows figure 2 . The model beam length l is 20m, and the sampling frequency f s It is 200Hz, and the damaged position is at the beam length 0.4l.

[0064] The specific implementation process is as follows:

[0065] S1. Install an acceleration sensor at any position on the bridge. In order to illustrate the effectiveness of the sensor installed in different positions of this method, the acceleration sensor 1 and the acceleration sensor 2 are respectively installed at 6 / 10 and 1 / 10 of the girder bridge, as figure 2 shown.

[0066] S2. Measure the acceleration response x(i) of bridge vibration, i=1, 2,..., N, where N is the measured response length. In this embodiment, th...

Embodiment 2

[0103] In order to illustrate the practicability and effectiveness of the present invention, in the real-time safety monitoring of an actual long-span suspension bridge, an accident was successfully monitored by using the technology of the present invention. The accident happened when the bottom of the steel box girder of the main span of the bridge was slightly scratched by a mast of a sand ship. The time of occurrence was 8 o'clock in the morning. The vibration of the bridge had abnormal behavior, and the measured response did not have any abnormality. However, the technology of the present invention was used to successfully monitor to this accident. In this embodiment, the object is a suspension bridge across the Pearl River, such as Figure 10 shown. Sampling frequency f s 200Hz. The specific implementation process is as follows:

[0104] S1. Install an acceleration sensor at any position on the bridge. In order to illustrate the effectiveness of sensors installed in ...

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Abstract

The invention discloses a bridge real-time safety state monitoring method utilizing a single measuring point response, comprising the following steps: S1, arranging an acceleration sensor on the bridge; S2, measuring the acceleration response of bridge vibration; S3, defining a moving time window, Intercept the measured signal, and reconstruct the signal in the window into an embedded state space matrix X by time delay method i ; S4, for the state space matrix X i Carry out principal component analysis; S5, define bridge safety evaluation index R 1 (i); S6. Get R in the window by moving the time window 1 Time series of (i); S7, according to R 1 (i) Whether there is a sudden change in the curve to judge whether the safety status of the bridge structure has changed. This method does not need an accurate finite element model as a benchmark for comparison, and only needs to use the response measured by a single acceleration sensor to effectively reflect whether the damage degree of the bridge structure has changed in real time.

Description

technical field [0001] The invention relates to the technical field of structural safety monitoring, in particular to a method for monitoring the real-time safety state of a bridge using a single measuring point response. Background technique [0002] At present, bridge structural health monitoring is facing the problems of too many measuring points and huge monitoring data. In the current bridge structure health monitoring system, since the construction of the bridge structure is completed, a large number of sensors have been installed on the bridge structure to monitor various structural characteristics in real time, resulting in an excessively large amount of information stored in the bridge structure monitoring system. On the one hand, the total amount of sensor equipment installed in the current bridge structure has greatly increased the initial investment and daily operation and maintenance costs of the bridge operator; on the other hand, the redundant monitoring data ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 聂振华沈兆丰谢永康邓杰龙刘思雨赵晨马宏伟
Owner JINAN UNIVERSITY
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